Screwdriver shaft



FIG. 1 is a front elevational view of a screwdriver shaft, embodying thenew design;

FIG. 2 is a top view with respect to FIG. 1;

FIG. 3 is a left end elevational view with respect to FIG. 1;

FIG. 4 is a right end elevational view with respect to FIG. 1; and,

FIG. 5 is a perspective view thereof.

The broken line portions of the drawing are for illustrative purposesonly and form no part of the claimed design.

The ornamental design for a screwdriver shaft, as shown and described.